/Engine/Source/Runtime/Experimental/Iris/Core/Public/Iris/ReplicationSystem/ReplicationOperations.h
Serialize the initial state of all dirty members a NetObject and changemask to a Bitstream, delta compressed against the default state.
static void SerializeInitialStateWithMask ( [FNetSerializationContext](API\Runtime\IrisCore\Iris\Serialization\FNetSerializationContext) & Context, const uint32 * ChangeMaskData, const uint8 *__restrict SrcObjectStateBuffer, const FReplicationProtocol * Protocol )